Will they need to have local mucosal immunity, which is in the mouth and nose, as well as serum immunity in the bloodstream?
他们是否需要在口腔和鼻子中具有局部粘膜免疫力，以及在血液中具有血清免疫力？
英语百科
Mucosal immunology
Mucosal immunology is the study of the portion of the immune system which provides protection to an organism's various mucous membranes from invasion by potentially pathogenic microbes. It provides three main functions: protecting the mucous membrane against infection; preventing the uptake of antigens, microorganisms, and other foreign materials; and moderating the organism's immune response to that material.